and Permanent Pasture. 
81 
Table sliowinp; the Vn-oow rroducc per Acre of 11 Plots of Artificial Grass 
(Clover-seeds and llyo-<;rass) grown at Escrick Park Home Farm, 1867. 
Plots. 
Manures useil. 
Produce per Acre. 
Fir» 
t Cutting. 
Second Cutting. 
Total. 
Tori'; 
cwt.:. 
lbs. 
Tons. cwts. 
lbs. 
Tons. 
c\\ Is, 
lbs. 
1 
L 
TVitt'ntr* nf* Ssnfln 
S 
10 
2 
1 
28 
10 
12 
5G 
Sulphatu of Ammonia 
10 
1 w 
2 
8 
1 2 
1 8 
.J 
3 
I\!iiieral Superphosphate 
i) 
1.2 
2 
11 
G8 
8 
4 
12 
4 
.1 
12 
9G 
2 
11 
23 
8 
4 
12 
5 
5 
9 
72 
2 
15 
80 
8 
5 
4:1 
G 
Muriate of Potash 
(> 
8 
81 
;) 
7 
50 
9 
IG 
28 
7 
Sulphate of Potash . . 
5 
7 
k; 
0 
11 
28 
7 
18 
44 
8 
Sulphate of Lime 
4 
9 
12 
o 
10 
GO 
G 
19 
72 
9 
fMineralSupt'rphosphateand'l 
10 
17 
9G 
2 
0 
0 
12 
1 7 
9"; 
\ Nitrate of Soda . . . . / 
10 
( Mineral Superphosphate and 1 
9 
0 
0 
4 
15 
40 
13 
15 
40 
\ Muriate of Potasli .. ../ 
11 
6 
3 
4 
2 
15 
40 
8 
IS 
44 
An rtttentive perusal of the preceding figures will bring to light 
several particulars, on which a few observations may not be out 
of place : — 
1. In the first place it will be noticed that two plots were left 
■uninanured. In all experimental trials at least two, or if possible 
three plots, should be left unmanured. Although the crop in a 
field may appear quite even and the soil uniform as regards 
depth, texture, and general character, the weight of the produce 
of such a field invariably differs to some extent in different parts. 
Natural variations in the productive powers of different portions 
of the same experimental field must be expected to occur in all 
cases ; but these variations must not surpass a certain limit, or 
else no fair and legitimate deductions with respect to the 
efficacy of the manuring matters employed can be made from 
the results of the experiments. Many of the anomalies which 
so much perplex the experimenting farmer I am inclined to 
think are often solely due to inequalities in the soil, or to differ- 
ences in the agricultural condition of the several experimental 
plots. For this reason it is absolutely necessary in field-trials 
to determine whether the natural variations in the productive 
powers of different parts of the experimental field are not so great 
as to spoil the experiments altogether. In the case before us it 
will be seen that one of the unmanured plots yielded, when calcu- 
lated per acre, 8 tons 5 cwts. and 40 lbs., and the second plot 8 tons 
18 cwts. and 44 lbs. ; the variations in the produce of the two 
plots thus amounted to 13 cwts. and 4 lbs., showing no greater 
difference than can be expected under favourable circumstances. 
2. Neither common salt nor sulphate of potash appears to have 
had any effect upon the produce, for it will be seen that the 
weight of the clover-seeds on plots 4 and 7, dressed respectively 
VOL. v.— S.S. G 
